Cardiac Conduction System and Understanding ECG, Animation.

[@Alilamedicalmedia]

Love this video? Check out our course "Cardiovascular Physiology" made entirely with videos like this (without watermark): Students, click here: www.alilaacademy.com/courses/cardiovascular-physiology-for-students Teachers, click here: www.alilaacademy.com/courses/cardiovascular-physiology-for-teachers NEW: Now you can also get access to our courses with our KZbin channel membership (Academy Access levels) Purchase a license to download a non-watermarked copy of this video here: www.alilamedicalmedia.com/-/galleries/narrated-videos-by-topics/ekgecg/-/medias/e912233a-cfb5-11e3-bc90-329e81129ea7-cardiac-conduction-system-and-ecg-anatomy-narrated-video

[@Novak2611]

I am a university professor and I admit KZbin is the best professor in the world. You should not take internet for granted.

[@madihasabir6125]

I agree with u as a lecturer

[@jessicawagner4556]

Finally found a video that nicely connects ECGs with the pumping of the heart. Thanks

[@shivamsrivastava1339]

Exactly

[@kelvinmunyiri9283]

And that's what we want...how and ekg and the heart are correlated

[@MohammedIbrahim-uc2nf]

Thank you very much ❤️❤️❤️

[@josephhicks3147]

I have a book of it.

[@sanathkumarshetty8222]

Hey gorgeous i think you are the actress who acted in prince movie😊😊

[@darbieliving]

Incase anyone need this in words :) Sinoatrial node or SA node is the natural pacemaker of the heart. It initiates all heartbeat and determines heart rate. Electrical impulses from the SA node spread throughout both atria and stimulate them to contract. The atrioventricular ir AV node serves as electrical gateway to the ventricles. It delays the passage of electrical impulses to the ventricles. This delay is to ensure that the atria have ejected all the blood into the ventricles before the ventricles contract. The AV node receives signals from the SA node and passes them onto the atrioventricular bundle - AV bundle or bundle of His. This bundle is divided into right and left bundle branches which conduct the impulses toward the apex of the heart. The signals are then passed onto Purkinje fibers, turning upward and spreading throughout the ventricular myocardium. Electrical activities of the heart can be recorded in the form of electrocardiogram. ECG or EKG. An ECG is a composite recording of all the action potentials produced by the nodes and the cells of the myocardium. Each wave or segment of the ECG corresponds to a certain event of the cardiac electrical cycle. When the atria are full of blood, the SA node fires, electrical signals spread throughout the atria and cause them to depolarize. This is represented by the P wave on the ECG. Atrial contraction, or atrial systole starts about 100 milliseconds after the P wave begins. The P-Q segment represents the time the signals travel from the SA node to the AV node. The QRS complex marks the firing of the AV node and represents ventricular depolarization: Q wave corresponds to depolarization of the interventricular septum. R wave is produced by depolarization of the main mass of the ventricles. S wave represents the last phase of ventricular depolarization at the base of the heart. Atrial repolarization also occurs during this time but the signal is obscured by the large QRS complex. The S-T segment reflects the plateau in the myocardial action potential. This is when the ventricles contract and pump blood. The T wave represents ventricular repolarization immediately before ventricular relaxation, or ventricular diastole. The cycle repeats itself with every heartbeat.

[@phumu0336]

God sent,Thank you ❤

[@Yasmeen-v5d]

Love❤❤❤❤!

[@courteneylungile]

Thank you so much ❤❤🙏

[@okotobasi97]

Life saver

[@Alilamedicalmedia]

Please NOTE: As we got this question a lot, we just want to clarify here: This video talks about PQ segment, not PR interval, and this is NOT a mistake. You may have seen more of PR interval in text books, because it is used for ECG interpretation. But you should be able to find PQ segment too. These are 2 different things. The PR interval measures from the start of P wave. So PR interval = P wave + PQ segment. To understand ECG, we intentionally use PQ segment as it represents one single event, easier to understand. The PR interval is used, however, to interpret ECG. You can see how to use PR interval to interpret ECG here (this is another one of our videos): kzbin.info/www/bejne/rYGudGSOZd6Ih5Y Thanks for watching!

[@rbbiology298]

Nice

[@sepehm]

So the video should be showing the PQ segment going from before P until the beginning of Q, correct?

[@mariammansour291]

But that is also called the PR segment in many different sources, so it was a bit confusing! Also, wouldn't that segment determine conduction through AV node and AV bundle? The PR interval is what determines the time required for the travel of signal from the SA node to AV bundle to my understanding. Please correct me if I'm wrong.

[@liciammsjacob2676]

ekg

[@Kitty-kl8mq]

Who all watching this in 2024😂😂

[@dr.myself]

Me 😅 just now i am watching it

[@97VIRTUESHEART]

Me😂😂

[@angelndlazi7146]

Writing a test tomorrow 😂😂

[@joshualumbe1842]

Test kicks off in weeks lol🤣

[@zarina_aqeeli]

Me.😂

[@leburbuprieta]

thank you from my apex

[@SurvivingAnotherDay]

lmao at first I was like, "what"? and than a few milliseconds later I'm like "omg, why didn't I ever think of this phrase!" :D

[@humblewarrior7593]

Indeed

[@wild23oo]

Hi please subscribe me i have made alot of video

[@lycheemyusic]

haha

[@bconmalinipullaiah7294]

🤣🤣🤣😅

[@DaleHerringTV]

Thank you so much. I've acquired bits and pieces throughout the unit, but haven't had a clear picture. This brought all of the pieces of the puzzle together. Thorough and informative, yet short and condensed; Just how I like it. Thanks again!

[@usergroupX]

thank you from the bottom of my ... heart i guess

[@deborahmugisa8611]

usergroupX lol super cool.

[@stevehumphrey667]

Do you know the bottom is technically at the top?

[@suabiraibrahim940]

...from the apex of my heart :)

[@deborahmugisa8611]

loooooooool

[@stevehumphrey667]

NAWLEJisPOWR I know

[@SofiaL1D]

this is pure gold for studying for my physiology class! amazing

[@khulemagutshwa1220]

SAME🤩🤩

[@MM-yx2qm]

@@khulemagutshwa1220 me too

[@marijasobot8062]

glad it helped

[@TemoteControl]

My 3yo has a resting heart rate of 53 from 68 when she was 2yo... she likely has progressed to 3rd degree heart block... this video has helped me to visualize and understand the function of the heart. Thank you

[@MoveInSilence2444]

This is the absolute best description of what is going on in the heart during the EKG on the INTERNET! THANK YOU!

[@nixonburat1587]

Best ever in 4 min .saw lots of videos of hours and hours. But ultimately understood the concept in just 4 mins

[@dentfortune7271]

It’s amazing how the ECG shows how action potential is moving across the membrane. From SA node to AV node action potential is facing (+) ^ PR interval. From AV to left Bundle Brunch( -) PR segment and negative deflection QRS complex( ventricular depolar/ atrial repolar. When the base is being depolarized (^ +), the signal continues upwards(-) etc. 2 words to describe the heart. YOUR MAJESTY!

[@yasmine9046]

This is so well explained I want to cry! You are doing an amazing job showing us that there are no difficult chapters, only poorly explained ones. Much love from a French med student 💙

[@mesutreyhan789]

so am ı .ıam Turkish doctor.good lucky

[@Liz-pl1bx]

I'm 16 and these videos help me to study biology on purpose to pass school exam. The way of explanation and colorful pics are fabulous! Thank you very much, greeting from Russia 😁👋

[@nirmalakothuru2593]

My goodness ❤God bless you dear ❤️🦋❤️

[@randomfyasmry]

This is why I appreciate KZbin. I finally understand this in under 4 minutes rather than a lecture for 5 hours and reading the textbook that has too many pages that explains this

[@radhikapatel1849]

This is the MOST SIMPLEST EXPLANATION EVERRRR !! Can't thank you enough for this 😁😁🙏

[@Alilamedicalmedia]

You're very welcome!

[@saisubhash1615]

Wow. Why can't everybody explain like you. Hatsoff sir. Thank you for this video.

[@GodsPrincess0]

My instructor literally explained this for 2 hours and I did not get it! Watched this video once and completely understood it immediately!! Thank you!

[@sweetpuppy120489]

OMG this is amazing! I wish I seen this earlier during nursing school! So much easier to understand! Thank you for this! So helpful now while studying for NCLEX

[@LizaLizzaaaa]

Since when do nurses read ECGs lol

[@MrHei913]

Sometimes I wonder why am i paying so much for my school fees when i dont get high quality lecture like this one over here hahaha

[@liveoprecio6221]

Because of certificate

[@christinapage7394]

If you thumbs down this video, you are special... This video went straight to the point and made the material clear.

[@charmedx3219]

It's university teachers that are jealous what takes them 10-15 to explain can take less that 4 and be more informative.

[@marijasobot8062]

thanks for saying im special

[@francinewintzmbbs4977]

Thank you so much! So short and simple - yet, well explained. Crazy how EKGs are such a challenge for most of us. This helps me a lot with understanding the basics before I begin my calculations & interpretations in a few minutes!

[@suzetjohnu6935]

Hi gd am currently pursuing the ekg course do u got any past exam papers to share will appreciate it thanks

[@emilioking3]

The use of visual diagrams really helped me better understand this concept, thank you

[@TheSMCSS1234]

wow, this video basically explains whole chapter about Cardiac physiology. I did not understand cardiac events in the class, but i understood here. I just have to study the notes i took while listening to your video. I appreciate you had subtitles too which made a lot easier. Very useful

[@shafeyazehrasayed]

Summary of ECG Graph P wave - Firing of SA node causing depolarization of atria After 100 milliseconds of beginning of P wave Atrial systole begins P-Q segment - Time taken for impulse to travel from SA node to AV node QRS complex - The firing of AV node and marks the ventricular depolarization Q wave - Depolarization of inter ventricular system R wave - Depolarization of the main mass of ventricles ( purkinje fibres ) S wave - Last phase of ventricular depolarisation at the base of heart Atrial repolarisation also occurs at the same time but signal is obscured(difficult to see) by the large QRS complex S-T segment - Plateau in myocardial action potential when Ventricles contract and pump blood T wave - Ventricular repolarisation immediately before Ventricular diastole CYCLE REPEATS

[@MaiiTariq]

BEST EXPLANATION EVER!! o.O! THANK YOU SO MUCH! GoodLuck for my NCLEX exam!

[@jasminflores6660]

I can seriously not thank you enough for how amazing this video is. I've spent weeks looking for a good ecg video and I have now found it!! Thank you! ❤️

[@kenjiro2676]

This is way better than the videos my teachers put up, they usually put-up Dr. Bruce Forciea's videos. His videos are narrated by a robot and there is no proper explanation such as the one you see in this video. Sometimes it is oversimplified.

[@shafeyazehrasayed]

Time stamps 1:28 ECG begins 1:52 P wave 2:15 P-Q segment 2:23 QRS complex (overall) 2:30 Q wave 2:35 R wave 2:42 S wave 2:58 S-T segment 3:09 T wave

[@Alilamedicalmedia]

Another question that we got often with this video: what is that DEPOLARIZATION and REPOLARIZATION? The answer is in our new video about cardiac action potential, here : kzbin.info/www/bejne/rGi0anWog8t8prM . The link is also in the "i" section of this video. This will help to understand the overall picture of how the heart works as well. Happy learning!

[@rodolfozach]

I liked this presentation. Well illustrated and good speaker's clarity and pace. Thank You. Around minute 2, I'd say though, the PR or PQ segment is the time the signal is held up by the AV node before firing.

[@VaniaVictoria_]

you explained what i learned in my 3 hour anatomy and physiology lecture in 3 minutes. Impressive.

[@spencerdavies542]

18 hours worth of lecture summarized in 3 hours worth of youtube videos. The cycle continues.. Lmao

[@ShesArizza]

thank you this was so easy to follow especially having the heart animation shown as the waves go by to show how the heart pumps blood throughout. very easy to understand than my prof's notes!

[@kimsordyl]

I absolutely love this concise yet detailed explanation! Thank you

[@JazzyTeen32]

I just wanted to say this was an excellent video. Thank You.

[@dianajihad1588]

The best video of cardiac conduction system ( believe me I’ve watched a lot )

[@veronicadutridge8609]

This is the most informative, easy to follow, yet concise video I've found on this subject. Thanks for posting!

[@Prasenjithourofstudy4200]

Finally it explains the mechanism behind the graph this good channel uses as a logo

[@chansedaolaya6559]

Thank you so much for this amazing video. It’s really get to the point. I have added your web as apart of my research sites for my nursing degree file. Again, thank you so much for what you have to offer.

[@RuToob]

This is the best video I've found. I'm not a med student, I'm just trying to get my MA certification. And this is very simple and easy to understand for my dumb brain! :-D Thank you so much!!!

[@MaximillianRed]

What's a MA certificate?

[@CXS1181]

Google search = "Medical Assistance Certificate"

[@nikkorondo09]

My university has tried teaching me this through 3 in depth lectures.... and I never understood them. I have an exam tomorrow and I completely understood and learnt this in 3 minutes lol

[@michaelachan3741]

Nikko Necesario which university?

[@yup_itsvincent6602]

Finally a video on ECG/EKG I can understand with words and visuals and animation.

[@bushraoweis14]

OMG this video help me big time in understanding the cardiac conduction! I will definitely support your channel by buying one of your merchandise.

[@SyedShayanAliShah]

Thank you very much. A tons is added to my knowledge. I am IT graduate and currently working on ECG data and got exactly from your tutorial what i was looking for

[@Sara-zl6bi]

so clear and easy to understand! thank you!!

[@zaza_yehaw]

this is exactly what we want short and easy yet covering pretty much everything

[@heavythinker16]

The number of hits on this video is living proof of how bad our teachers are.

[@naemiwelter4417]

My teacher literally went over this in less than a minute and I was like uuuh... what?

[@navadeepdorai2918]

I agree with you

[@Dr.M.Courses]

agree lol

[@perryjackdwarf8591]

she just set this as homework to watch

[@_nessz]

I am doing a En course at this institute, I have to watch first aid on KZbin because my teacher is literally reading off slides and told us to go figure it out. I am just over it and yea, it is bad that some people rather get paid to just read the slides rather help engage and actually teacher... i should have done the online option.

[@asiaoptimistic162]

no words are enough to thank you.....i am sure i would never get it this way from my teacher ....so tanks alot

[@KripiMehra]

Wow...Explained very well...Thanks

[@AtulSharmaKaushal]

Very knowledgeable.

[@Retina_0101]

Crystal clear explanation,you saved my time !!

[@YoungJayGame]

wow,,, I dont even speak English, but this helped me understand how my heart works D:

[@BPantherPink]

SUPERB graphics and detailed explanation as per the graphic progression !! Better than most orhers I've seen ❤

[@swatimehra9652]

Very Good ....nd...Well explanation....Nice vedio.....Easy to undrstand and...learn this process.....

[@vikasjangra1338]

Vikas

[@therealtommy4116]

Swati Mehra wish I could say that about your comment.

[@SuperLadyBanana]

Been reading many books but this vid has made everything crystal clear. Thanks for the vid :)

[@RechtmanDon]

Wow, the clearest explanation I've ever seen!

[@pandesalcheeks]

You, sir, are amazing! Thanks so much for helping me to understand this better :)

[@yaseenkhan1435]

Day after tomorrow i am having an ospe/osce exam watching this legend video this video help me so much to the point very informative

[@tahirugaselmi6992]

thank you alila medical media for your sharing

[@abhinavadvani3996]

Seriously...I never realised that myself who is very bad in study would understand this concept so easily...Thank you sir thank you very much

[@christianhoude219]

I don't even know why I went to school

[@urmama54]

cause i told you so christian

[@manamealane]

Ur Mama 😂😂😂😂😂😂😂

[@cosmocelli]

This is funny 😂😂

[@parmeshwarsuryawanshi3221]

Once sit alone and think about it. You will find your answer.

[@sublimetrance]

For a piece of paper.

[@simrankhan2906]

From AV node to bundle of His after filling the ventricles😆😆😆yayyy I got it✌✌Thanks for this easily understand video👍

[@hollygolightly8048]

Nice explanation. thank you!

[@fadumoabdi7094]

I have a test coming up and the book was confusing me, thanks for this short and easy-to-understand explanation!!

[@Fialol109]

Can you please do both the pulmonary and lymphatic systems?

[@Alilamedicalmedia]

We already have those, just look them up on our channel!

[@Fialol109]

@@Alilamedicalmedia sounds good thanks!

[@alisvela491]

I’ve been searching the whole internet for the last 3 week trying to find a video that introduces me to ECG and finally I can say now that I know what ECG is, well and simply explained sir.

[@avril4476]

This is an amazing video!

[@PhoenixRise0101]

Thank you for this fantastic video. I have struggled with this, and you have made is the easiest thing to understand in a less than 5-minute video.

[@1cityandcolour1]

nice video! ButI have one question: What is the connection between re/depolarization and the graph beeing negative/positive? E.g. the Q wave is the DEpolarization of the septum and the graph becomes negative, then the R wave is also DEpolarization of the ventricles but it goes up, and then down again in the same event? I don't really get how the graph is oriented or what it relates to.. I hope someone can help me, thanks!

[@Alilamedicalmedia]

+1cityandcolour1 The direction of the electrical signals (be it depolarization or repolarization) determines the positive/negative values : Depolarization towards a lead produces a positive deflection, depolarization away from a lead produces a negative deflection. The reverse is true for repolarization. So the graph looks different for different leads. The graph presented here is for lead II, or III - the most popular leads - the ones that are located below the heart, roughly in the same direction of the cardiac axis. It may look completely different for another lead (avR for example). Please see our video on the 12-lead ECG for more info : kzbin.info/www/bejne/oaivk4aubqeBmLc

[@kevinpham9176]

Whoa! That is a longggg question!

[@mostafawalid8743]

hey my dear.. It is too late but I just want to answer to your question all Q R S are depolarization waves but their being negative or postive is according to the direction of electrical conductivity on them if it is with the cardiac axis or not you know that the cardiac axis is downward forward to the left.. and represents the total summation and direction of electricity in whole heart.. if the impulse is with the axis i.e downward forward to the left the recorded wave is positive ant vice versa ... q wave os negative because electricity is conducted to septum from the end of left bundle branch upward to right ie completely opposite of cardiac axis and it is very small because septum is a thin wall.. and is conducted to ventricles through rt and left bundle with cardiac axis at the same time .. finally s wave is negative becuse purkingie are directed upward to base to depolarize the base of heart against cardiac axis and remember that the amplitude of the wave depends on the thickness of muscle depolarizing so sometimes q wave is not recorded

[@1cityandcolour1]

Mostafa Walid Hey man, thanks for you answer. In the past year since I wrote that comment I also had physio class, so now I also figured it out :D But thanks anyways, I really appreciate it! :)

[@caripage9327]

Mostafa Walid helped me too, I wasn't understanding the other answers. I get this though!

[@ElizabethRivera-wi4yy]

Thanks for sharing this video. Very helpful and way easier to understand than any other books and websites

[@TheDudeRides38]

I always thought the top of the r wave was when the ventricles contracted.... I was wrong

[@TheGap1952]

Amazing that you managed to get John Malkovich to narrate this!

[@arielartista93]

Perfect, thanks so much!

[@YenaShah]

WOW! things got in my brain quite naturally after I saw this video and read the book. thank you so much for creating this! very grateful.

[@durali3032]

The ECG was explained to me for at least 3 times in college and I’ve watched tons of videos and FINALLY now I got it!! Thank you so much for the great explanation🤍

[@ElementalSkater001]

If P = depolarization (more positive) and T = repolarization (more negative) Why are both depicted by a positive upward bump on the EKG?

[@thomasmacfarlane2014]

+ElementalSkater001 repolarization works in the exact opposite manner. during depolarization positive deflection when heading towards a lead. depolarization equals positive deflection away from the lead. myocardium cells depolarized from inside out and repolarized from out side in. hope this helps. but this is all dependent on muscle mass, infarct and a list of other issues that may be going on

[@uppalasainikhilchakravarth1183]

it is because repolarisation,it is negative charges moving from outer myocardium towards innermyocardium or simply the negative charges are moving from ventricular myocardium towards the negative lead connected to your hand so,negative charges moving towards negative lead produces positive deflection in ecg,afterall (-*-)=+.......

[@vikramdalavi5660]

Thanks I UNDERSTOOD VERY WELL..good project.. This video was shown in our class by our sir..nice video

[@sunithasampath479]

Hi, Can I get your permission to use this video for teaching our students please?

[@Alilamedicalmedia]

+Sunitha Sampath You are welcome to link to or share/embed the KZbin video. But if you need to download it please purchase a license from our website. Thanks

[@sunithasampath479]

Many thanks

[@DavidTranAnh]

The cardiac always scared me, but damn this video was so well done I feel absolutely enlightened. I guess I never like cardiac only because it was never explained to me very well. Thank you from the bottom of my heart for this resource.

[@shahdbelal9469]

At this point, I'm wondering if our teachers themselves understand the material they present.

[@ranaebeyerlein7010]

Maybe not, but you could tell them that you found this video very helpful.

[@rosembi1592]

you just save my life... best video ever. Exactly what i was looking for, thank you so much sir

[@helmaerlcheny9894]

that polarization repolarization needs some explaining

[@georgetheofanous6792]

Imagine repolarization as the charging of the node. When it is fully charged, it will send out it's energy as a pulse. This is called the depolarization phase.

[@Alilamedicalmedia]

Helmaerl Cheny Cells are polarized, meaning there is a difference in electrical potential across the cell membrane: positive charge outside, negative charge inside. That is the resting state of the cell. When a cell is depolarized - there is a change in electrical potential making the cell membrane "less polarized'. This is when the cell is electrically active and fire action potentials, in this case, it causes contraction of the cardiac muscle. The cell then returns back to the normal resting state - being "repolarized" - this is when the muscle is relaxed.

[@Alilamedicalmedia]

+Helmaerl Cheny As we got this question a lot, we have made a new video about action potential, depolarization/repolarization here - this is the process in neurons, but the principle of depolarization and repolarization is the same, this will help clarify further: kzbin.info/www/bejne/n3OniYKqlNp7irM

[@jeannyestevez7122]

Helmaerl Cheny hahahah

[@okzygin7756]

This one video beats a 60 minute lecture snore fest from when I was in pre med. Those snore fests are why I decided to leave med and go into epidemiology instead. If the lectures were concise and visual like this video my god would my life be different.

[@zaynumar0]

Not digging Medicine , just watching this for fun

[@willcubias9291]

Thanks this video made everything easier. I'm taking a summer class and my professor goes so fast that I felt behind in this part. I tried to read the textbook but its not the same as someone explaining it to you slowly. Thanks .!!!!

[@toddlavigne6441]

sounds like your professor sucks, very sad when a free video does a better job than a prof making 100,000 a year teachers are no longer needed in the formal classroom model of educating people. IMO

[@nikistarss]

Why am i studying this im 13 and still in middle school our class is not even close to learning about this lol

[@iShuraBashar]

I never understood ECG until I watched this video. Thanks.

[@maxtube3052]

الضاهر بس اني عربي 😿🥴😂😂👋🏻

[@ThiagoZoz]

Thanks for the video, direct and easy explanation for medical students!

[@happysoul7304]

Amazing! Depicted crystal clear..! ❤️

[@ashiijazz2789]

so nice video every point is so clear,, ihve not watched any video like this on ECG topic ,, thank you soo much

[@nilanjana7540]

Finally understood ECG concept😇thanks a lot to present it so clearly😇

[@Alilamedicalmedia]

Most welcome 😊

[@yleniamafodda9347]

short and complete video ! thank you ! after the T vawe there is the U vawe = the ripolarization of the papillary muscles wich prevents valve prolapse when the pressure in the ventricle is maximal

[@crystalroy2469]

You are a lifesaver! These Anatomy books are torture!

[@chelseaplatt9827]

Thank you!!! After about a dozen videos, I finally understand the difference between the QRS complex and the ST segment.

[@userr_aa]

I'm here again bcs I forgot to like this awesome vid with a very clear exlanations on the first watch. So here it is!

[@prakashupreti6613]

Please make more videos on EKG. Your explanations are one of the best. Many topics like Sino atrial dysfunction, compensatory vs non compensatory pause, supraventricular tachycardia(AVRT, AVNRT), junctional rhythms...and the list goes on and on. Please make videos on all EKG sub topics.

[@Alilamedicalmedia]

Check out our cardiology playlist, many of those topics are already in there!

[@heavenlyflower1113]

This helped me passed my Arrhythmia test. Well explained!

[@JOHNRICHARDHUNGAYO]

this lesson really confused me in class, thank you for this!!!!